Head room in the front of 2016 Toyota Tundra Limited 5.7L V8 4×4 Double Cab 6.6 ft. box 145.7 in. WB is 40″ while in the rear it is 39″. Front shoulder room and rear shoulder room are 66″ and 66″ respectively. While the front room is minded since 42.5″, the rear leg room is minded since 34.7″.